BTW, anecdote from President's Day weekend. Two friends of mine had a 7:30 gig at DTD. One left from 192 in Kissimmee around 6 p.m. (he's maybe 2 miles west of Orange Lake, if that). He made it by 7:15, only because he jumped on the 429. On Buena Vista, he waited through 10 cycles to get past the DHS/Boardwalk light.
His partner, coming from downtown, left at 6:30. He finally took the stage at 9:20. The last hour of that was after he got off at Exit 67. And keep in mind, neither of them had to worry about parking (reserved spots for artists).
Whenever Disney Springs is eventually complete--still over 2 years out--it's going to take years to rebuild the trust/loyalty of locals. The new garage only seems to have made things worse. That is a killer reputation to have to overcome.